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Can You Tell Which Of These Ring Gears Are Inertia Or Pre-enaged?


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#1 danrock101

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Posted 03 December 2010 - 09:08 AM

Posted Image



I think I know which is which but I need to make sure, and how much does it cost to replace a ring gear?
Cheers
Dan

#2 tommy13

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Posted 03 December 2010 - 09:26 AM

The left one looks like the pre-engage one to me. There is a lead ( bevel) on the edge of the teeth on the inertia ones.

#3 danrock101

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Posted 03 December 2010 - 09:42 AM

yes the left 1 definatly pre-engaged, atleast it worked with a pre-engaged starter :thumbsup: I just wasn't too sure about the right one if that was pre-engaged aswell as they do look more alike in person, they look more diferent in the picture. It's a shame the right one is inertia as intertia starters are horrible

#4 mini13

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Posted 03 December 2010 - 10:54 AM

count the teeth, the inertia one is about 110 teeth and the pre engaged one about 120, the exact no are on minispares.

#5 danrock101

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Posted 03 December 2010 - 12:15 PM

cheers guys, 107 and 129 if I counted correctly

#6 glyn

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Posted 03 December 2010 - 02:20 PM

thats correct! well mine had that many teeth anyway.

#7 Southy

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Posted 03 December 2010 - 08:28 PM

As has been already said, ring gear on the left is a pre-engaged and the right is an inertia.

Cost isn't a major factor, infact if you have the tools you can even do it yourself.

#8 MRA

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Posted 06 December 2010 - 03:36 PM

They are both pre-engaged ring gears....... the one on the right is also for inertia type starters.

There was a short period in the Metro's history when the starter motor used, had a similar size and shape to the inertia type, it also used the inertia ring gear.....

#9 danrock101

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Posted 06 December 2010 - 04:58 PM

ooooo so I can use a pre-engaged starter for both of them?

#10 MRA

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Posted 06 December 2010 - 06:09 PM

No sorry, you would need an early type pre-engaged starter for the right hand ring gear, which wouldn't fit in your standard round nose Mini, however as said above ring gears are not so expensive and dead easy to fit..... all you need is a little heat to "expand" the ring gear enough to slide it in to position, once cooled it shrinks on to the flywheel and will not easily fall off...... unless too much heat has been applied of course :)

#11 danrock101

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Posted 06 December 2010 - 06:13 PM

ahh I see, new ring gear it is haha, thanks for your help

Edited by danrock101, 06 December 2010 - 06:13 PM.


#12 MRA

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Posted 06 December 2010 - 06:30 PM

Yes, sorry if my previous but one post confused you :)




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